Cause:
It appears that there is only one set of cable ladder attachment holes on the side of the pass-through data cable partition.

Resolution:
The holes of the pass-through data cable partition were expanded and only the 12" wide cable ladder will attach to it.
The solid data cable partitions will accept both 6" and 12" cable ladders.

NOTE:
AR8164ABLK and AR8165ABLK both contain hardware that allow cable ladder to attach to the NetShelter partitions and troughs.
If you have cable ladder that requires attachment hardware please see sku AR8166ABLK Cable Ladder Attachment Kit. .